Group Mean and Standard Deviations for 10th, 50th and 90th Percentile Levels of Activity for the Flexor Digitorum Superficialis, Flexor Pollicis Longus, Extensor Digitorum Communis and Extensor Carpi Radialis Brevis Muscles During Polishing With 3 Types of ... Group Mean and Standard Deviations for 10th, 50th and 90th Percentile Levels of Activity for the Flexor Digitorum Superficialis, Flexor Pollicis Longus, Extensor Digitorum Communis and Extensor Carpi Radialis Brevis Muscles During Polishing With 3 Types of Handpiece Gayle McCombs, and Daniel M. Russell J Dent Hyg 2014;88:386-393 ©2014 by American Dental Hygienists Association